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I had to dig a bit deeper, and I'm not what they call "an expert," and of course things on the Internet are always "true," but wiki seems to support my assertion that "POTS" as we knew it died in this country sometime after 1988.I have POTS, through centurylink. Installed in 2010, no VOIP for me. So there are still some out there.
If you have a twisted-pair phone line and telco service to your home, it is by definition not "POTS," at least in the United States. But, never say never…
They call the old POTS acronym a "retronym" which is a new word for me
"Plain old telephone service (POTS), or plain ordinary telephone system,[1] is a retronym for voice-grade telephone service employing analog signal transmission over copper loops. POTS was the standard service offering from telephone companies from 1876 until 1988[2] in the United States when the Integrated Services Digital Network (ISDN) Basic Rate Interface (BRI) was introduced, followed by cellular telephone systems, and voice over IP (VoIP). POTS remains the basic form of residential and small business service connection to the telephone network in many parts of the world. The term reflects the technology that has been available since the introduction of the public telephone system in the late 19th century, in a form mostly unchanged despite the introduction of Touch-Tone dialing, electronic telephone exchanges and fiber-optic communication into the public switched telephone network (PSTN)."